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Iliocostalis Lumborum

origin: anterior surface of a broad and thick tendon which originates from the sacrum, spinous proceses of the lumbar vertebrae and from  
      the inner lip of the iliac crest;
insertion: inferior borders of the angles of the lower 6 or 7 ribs;
action: acting bilaterally, extension and hyperextension of the spine; acting unilaterally, laterally flexes the spine;
nerve supply: posterior rami of the spinal nerves;
synergists: Longissimus Thoracis , Quadratus Lumborum